Adaptability of the ocean and earth tidal models based on global observations of the superconducting gravimeters |
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| Authors: | Email author" target="_blank">Heping?SunEmail author Bernard?Ducarme Houze?Xu Leslie?Vandercoilden Jianqiao?Xu Jiangcun?Zhou |
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| Institution: | 1. Key Laboratory of Geodynamic Geodesy, Institute of Geodesy and Geophysics, Chinese Academy of Sciences, Wuhan 430077, China
2. Royal Observatory of Belgium, 3av. Circulaire, B-1180, Brussels, Belgium |
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| Abstract: | The adaptability of recent ocean tidal models and Earth tidal models is investigated comprehensively by means of 22 high precision
tidal gravity observation series at 20 stations of the Global Geodynamics Project. Careful preprocessing of the original observations
was carried out using international standard algorithms and the tidal gravity parameters were computed. The gravity load vectors
of 8 main constituents are obtained based on loading computation theory and various global ocean models. The loading corrections
of 14 secondary constituents are obtained based on a two-dimensional interpolation technique. Considering different characteristics
of the wave amplitude, a method of “non-identical weighted mean” is developed for computing the averaged observed residual
and remaining residual vectors at each station. The efficiency of the loading correction and the discrepancy between corrected
amplitude factors and theoretical ones are analyzed. Meanwhile the calibration problem of the instruments is also discussed.
After loading correction, the averaged tidal gravity parameters for all stations are obtained. The results show that the discrepancies
between the global mean amplitude factors and theoretical values are less than 0.3%, the largest calibration error of the
instruments is less than 0.5%. On the other hand, there are indications that the slight phase advance of K1 with respect to O1 in Mathews’ theory could be verified by ground based tidal gravity observations |
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| Keywords: | superconducting gravimeters Global Geodynamics Project determination of the tidal gravity parameters verification of the global ocean and Earth tidal models |
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